SARATOGA SPRINGS, N.Y. — Because the Breeders’ Cup has doubled the number of races since seven were contested in the inaugural event in 1984, it is hard to make comparisons from one decade to another. There is little doubt, though, that this year’s Breeders’ Cup was among the most “formful” in history. That half of the 14 races were won by post-time favorites may not be all that unusual, but the fact that the odds on the average winner were onl…